I have had a sore throat for 4 months now. I have gargled with salt water, vinegar, baking soda, and it does not get better. Now my tongue is supersensitive, there are white spots in the back of my throat, my lips burn, my tonsils are swollen, it feels like I have something scratching the back of my throat all the time. What test can i take to see if i have throat or mouth cancer?